Java 中的 ChoiceFormat setChoices()方法，示例
原文:https://www . geeksforgeeks . org/choice format-set choices-method-in-Java-with-examples/
Java . text . ChoiceFormat类的 setChoices() 方法用于在 Choice format 对象中设置定义了限制和格式的新的 Choice 项。
语法:
public void setChoices(double[] limits, String[] formats)
参数:该方法取以下参数:
- Limit: is a binary array containing option limit.
- Format: is an array of string values, which will contain the format of choiceitem.
返回值:这个方法不返回任何东西。
异常:如果限制或格式为空，该方法抛出 空指针异常 。
以下是说明设置选择()方法的示例:
例 1:
// Java program to demonstrate
// setChoices() method
import java.text.*;
import java.util.*;
import java.io.*;
public class GFG {
public static void main(String[] argv)
{
try {
// creating and initializing ChoiceFormat
ChoiceFormat cf1
= new ChoiceFormat(
"4#wed| 5#thu | 6#fri | 7#sat");
// creating and initializing new double array
double[] newlimit = { 1, 2, 3 };
// creating and initializing new String array
String[] newformat = { "sun", "mon", "tue" };
// setting the limit and format in
// ChoiceFormat Object
// using setChoices() method
cf1.setChoices(newlimit, newformat);
// display the result
System.out.print("updated Choiceformat object: "
+ cf1.toPattern());
}
catch (NullPointerException e) {
System.out.println("\nLimit or Format is null");
System.out.println("Exception thrown: " + e);
}
}
}
输出:
updated Choiceformat object: 1.0#sun|2.0#mon|3.0#tue
例 2:
// Java program to demonstrate
// setChoices() method
import java.text.*;
import java.util.*;
import java.io.*;
public class GFG {
public static void main(String[] argv)
{
try {
// creating and initializing ChoiceFormat
ChoiceFormat cf1
= new ChoiceFormat(
"4#wed| 5#thu | 6#fri | 7#sat");
// creating and initializing new double array
double[] newlimit = null;
// creating and initializing new String array
String[] newformat = { "sun", "mon", "tue" };
// setting the limit and format in
// ChoiceFormat Object
// using setChoices() method
cf1.setChoices(newlimit, newformat);
// display the result
System.out.print("updated Choiceformat object: "
+ cf1.toPattern());
}
catch (NullPointerException e) {
System.out.println("Limit or Format is null");
System.out.println("Exception thrown: " + e);
}
}
}
输出:
Limit or Format is null
Exception thrown: java.lang.NullPointerException
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